Array setBoolean() Method in Java with Examples

The java.lang.reflect.Array.setBoolean() method is an inbuilt method used to set a specified Boolean value to a specified index of a given object array.

Syntax:



Array.setBoolean(Object []array, int index, boolean value)

Parameter: This method takes three parameters:

  • array: array of type Object which is to be updated.
  • index: index of the array which is to be updated.
  • value: boolean value that is to be set at the given index of the given array.

Return type: This is a void type method and doesn’t returns any value. The update reflects upon the Object array passed as the argument.

Exception: This method throws following exceptions:

  • NullPointerException– when the array is null.
  • IllegalArgumentException– when the given object array is not an Array.
  • ArrayIndexOutOfBoundsException– if the given index is not in the range of the size of the array.
  • Below is the implementation of Array.setBoolean() method:

    Program 1:

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    // Java code to demonstrate setBoolean()
    // method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining boolean array
            boolean b[] = { true, false, true };
      
            // array before using setBoolean()
            System.out.print("Before Set : ");
      
            // printing the array
            for (boolean x : b) {
                System.out.print(x + " ");
            }
      
            // boolean value to be set
            boolean value = true;
      
            // setBoolean method of class Array
            Array.setBoolean(b, 1, value);
      
            // array after using setBoolean()
            System.out.print("\nAfter Set : ");
      
            // printing array
            for (boolean x : b) {
                System.out.print(x + " ");
            }
        }
    }

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    Output:

    Before Set : true false true 
    After Set : true true true
    

    Program 2: To demonstrate java.lang.NullPointerException

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    // Java code to demonstrate setBoolean()
    // method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining boolean array to null
            boolean b[] = null;
      
            try {
                // boolean value to be set
                boolean c = false;
      
                // passing a null array as parameter
                Array.setBoolean(b, 5, c);
            }
            catch (Exception e) {
                System.out.println("Exception : " + e);
            }
        }
    }

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    Output:

    Exception : java.lang.NullPointerException
    

    Program 3: To demonstrate java.lang.ArrayIndexOutOfBoundsException

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    // Java code to demonstrate setBoolean()
    // method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining boolean array
            boolean b[] = { true, false, true };
      
            try {
                // value to be set
                boolean c = false;
      
                // passing index as 5 when size is 3
                Array.setBoolean(b, 5, c);
            }
            catch (Exception e) {
                System.out.println("Exception : " + e);
            }
        }
    }

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    Output:

    Exception : java.lang.ArrayIndexOutOfBoundsException
    

    Program 4: To demonstrate java.lang.IllegalArgumentException

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    // Java code to demonstrate setBoolean()
    // method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining boolean variable
            boolean b = true;
      
            try {
                // value to be set
                boolean c = false;
      
                // passing variable in the place of an array
                Array.setBoolean(b, 5, c);
            }
            catch (Exception e) {
                System.out.println("Exception : " + e);
            }
        }
    }

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    Output:

    Exception : java.lang.IllegalArgumentException: Argument is not an array
    


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